<?php


class Kindle implements EBookInterface
{
    private $page = 1;
    private $totalPage = 100;

    /**
     * @return mixed
     */
    public function unlock()
    {
        // TODO: Implement unlock() method.
    }

    /**
     * @return mixed
     */
    public function pressNext()
    {
        $this->page++;
    }

    /**
     * @return mixed
     */
    public function getPage()
    {
        return $this->page;
    }
}